body {
    width: 90%;
    margin: 0.5rem auto;
    min-width: 250px;
    font-size: 24px;
}


/* Include the padding and border in an element's total width and height */

* {
    box-sizing: border-box;
}


/* Remove margins and padding from the list */

ul {
    margin: 0;
    padding: 0;
}


/* Style the list items */

ul li {
    cursor: pointer;
    position: relative;
    padding: 12px 8px 12px 40px;
    list-style-type: none;
    background: #eee;
    font-size: 22px;
    transition: 0.2s;
    /* make the list items unselectable */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}


/* Set all odd list items to a different color (zebra-stripes) */

ul li:nth-child(odd) {
    background: #f9f9f9;
}


/* Darker background-color on hover */

ul li:hover {
    background: #ddd;
}


/* When clicked on, add a background color and strike out text */

ul li.checked {
    background: #888;
    color: #fff;
    text-decoration: line-through;
}


/* Add a "checked" mark when clicked on */

ul li.checked::before {
    content: '';
    position: absolute;
    border-color: #fff;
    border-style: solid;
    border-width: 0 2px 2px 0;
    top: 10px;
    left: 16px;
    transform: rotate(45deg);
    height: 15px;
    width: 7px;
}


/* Style the close button */

.close {
    position: absolute;
    right: 0;
    top: 0;
    padding: 12px 16px 12px 16px;
}

.close:hover {
    background-color: #f44336;
    color: white;
}


/* Style the header */

.header {
    /*background-color: rgba(47, 47, 47, 0.98)*/
    background-color: #f44336;
    padding: 30px 40px;
    color: white;
    text-align: center;
}


/* Clear floats after the header */

.header:after {
    content: "";
    display: table;
    clear: both;
}


/* Style the input */

input {
    margin: 0;
    border: none;
    border-radius: 0;
    width: 75%;
    padding: 10px;
    float: left;
    font-size: 22px;
}


/* Style the "Add" button */

.addBtn {
    padding: 10px;
    width: 25%;
    background: #d9d9d9;
    color: #555;
    float: left;
    text-align: center;
    font-size: 22px;
    cursor: pointer;
    transition: 0.3s;
    border-radius: 0;
}

.addBtn:hover {
    background-color: #bbb;
}